Here are three in-dash heater & A/C duct components from an A/C-equipped '71 Nova.  Should fit '71 to '74 Nova with A/C, as well as other GM division Nova-based compacts.  Includes the two ducts shown, plus the fox with internal flap that attaches to the heater box.  The two ducts are in good undamaged condition.  The box is NOT in good condition, there is a rather large piece of plastic missing from it as shown in photos, and you'll want to glue or tape in a piece of plastic or sheetmetal if you use this box (there are also two hairline cracks in the plastic of this box).  The metal components of these parts have no rust damage, just surface rust.  Buyer to pay shipping based on location, $33 for the eastern half of the US and $22 for the west coast (if you're on the west coast and eBay charges you the full shipping, I will refund you the difference of $11).